Three knives cutting

Abstract

The invention relates to a process and a device for producing a contour of a planiform piece, intended, in particular, for the internal trim of motor vehicles, in which the piece (1) is cut to define at least an apex (2) of the contour (3), having a given profile P, and a side (4), or so-called first side, of the contour (3) extending from the apex (2). According to the invention, there are carried out sequentially: on one hand, cutting of the piece (1) to produce simultaneously at least the apex (2), according to the profile P, and to cut the first side (4) over a portion, referred to as a fraction F, of its length extending from the apex (2); on the other hand, at least another operation of cutting the piece (1) to produce the first side (4), including at least a portion at least of the fraction F.

Description

TECHNICAL FIELD[0001]The invention relates to a process and a device for producing the contour of a planiform piece, intended, in particular, for the interior fittings of motor vehicles.BACKGROUND[0002]The expression “planiform piece” is to be taken as meaning a piece the thickness is very considerably less than the other dimensions, said piece not necessarily being flat but possibly having inwardly and / or outwardly facing deformations.[0003]Although more particularly provided for pieces intended for the interior trim of the bodywork of motor vehicles passenger compartments such as, for example, door panels, cabinet-work or dashboards, the invention can be used in any other field.[0004]At the present time, when it is wished to obtain a piece the contour of which has apices of a particular profile, in particular rounded, use is made of knives corresponding to each of the sides of the piece and all or part of the apices located at each end of the side cut. The knives are actuated sim...

AI Technical Summary

Benefits of technology

[0006]The object of the present invention is to provide a process and device for producing a contour of a planiform piece, in particular intended for the interior fittings of motor vehicles, that remedy the aforementioned drawbacks and make it possible to improve the aesthetic appearance of said contour by improving the cut and, consequently, reducing the visibility of the joins.

[0007]Another object of the present invention is to provide a process and a device for producing a contour of a planiform piece intended, in particular, for the interior fittings of motor vehicles, that make it possible to prevent the pushing back of the parts of the piece to be cut.

Problems solved by technology

A first drawback of this process is that leads to marking, or even incorrect cutting of the part, owing to unsatisfactory cut joins in the area of the point of contact of the knives.

Furthermore, when the knives approach on either side, one observes, at the apices, a pushing back of the parts of the piece to be cut, which can be prejudicial to the definition of the contour and to the cut.

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